Added a form for entering a passphrase for a private ssh key and the corresponding logic for processing a private key

client/ui/qml/main.qml

@@ -234,6 +234,9 @@ Window  {
             popupWarning.popupWarningText = message
             popupWarning.open()
         }
+        function onShowPassphraseRequestMessage() {
+            popupWithInputField.open()
+        }
     }
 
     MessageDialog {
@@ -355,4 +358,21 @@ Window  {
     PopupWarning {
         id: popupWarning
     }
+    PopupWithInputField {
+        id: popupWithInputField
+        placeholderText: "Enter private key passphrase"
+        yesFunc: function() {
+            editingFinished()
+            close()
+            UiLogic.passphraseDialogClosed()
+            text = ""
+        }
+        noFunc: function() {
+            close()
+            UiLogic.passphraseDialogClosed()
+        }
+        onEditingFinished: {
+            UiLogic.privateKeyPassphrase = text
+        }
+    }
 }